RTEMS | cpukit: Create DHRL Library for DRAM Latency Mitigation (!1193)

[Wayne Thornton (@wmthornton-dev)]

Wayne Thornton commented on a discussion on cpukit/dhrl/dhrl.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150698

 > +  }
 > +
 > +  uint8_t  best_bit = 6;
 > +  uint64_t lowest_latency = UINT64_MAX;
 > +
 > +  uint8_t max_safe_bit = 0;
 > +  size_t  safe_size = ctx->active_config.memory_region_size / 2;
 > +  while ( safe_size > 1 ) {
 > +    max_safe_bit++;
 > +    safe_size >>= 1;
 > +  }
 > +
 > +  dhrl_debug_printk(
 > +    "\nDetermining DDR Interleave Bit (Testing bits 6 to %u)...\n",
 > +    max_safe_bit
 > +  );

Done. I've added RTEMS_DHRL_DEBUG to the `cpuopts.yml` file and moved `#define` to source code. Will be pushed in next commit.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150698
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